Lubba is a particularly portly and sometimes wisecracking purple Luma who appears in Super Mario Galaxy 2. He is the leader of the Lumas in the game. He reacts accordingly to guests on his ship, such him stating to be allergic to Honeybees and that he is good friends with Whittles. Similar to other Lumas, Lubba can also be fed by shooting Star Bits at him.

Throughout the game, Lubba informs Mario of several different things, most of the time he stands by Starship Mario's wheel and tells Mario different things to help him out (he will even tell the player when their batteries are running low, and that he should replace them, in case they die in a dangerous place). However he can often be found in numerous other places on the ship. Whenever a new item or passenger comes aboard the ship, Lubba appears somewhere else on the ship and tells Mario something about the new object or creature and/or cracks a joke about them. Whenever Mario enters a new world, Lubba will fly off of Starship Mario and say something about Mario's progress.

After the player beats Bowser and after the final 242nd Power Star from the Grandmaster Galaxy is collected and Rosalina boards Starship Mario, it is revealed that Lubba has met her before. However, where he first met her is unknown. He thanks Mario for his hard work bringing who he calls "The Lady of the Shooting Stars" on board the ship.

In Super Smash Bros. Ultimate, Lubba can be seen in the Mario Galaxy stage again, piloting Starship Mario like in Super Smash Bros. for Wii U. Lubba also appears as a support spirit, granting the fighter immunity from reversed left-and-right controls when equipped. The Lubba spirit battle pits the player(s) against a giant Kirby who starts the battle holding a Super Launch Star. There is decreased gravity for the duration of the battle (unless a spirit that counters this is equipped), and the battle takes place on the Mario Galaxy stage with the music "The Starship Sails" from Super Mario Galaxy 2 playing.

This Luma offers Mario all kinds of spacefaring support aboard Starship Mario. And who better to do it? With his feet always floating a little bit off the ground, you know he's got his space legs! Lubba's cheerfully casual way with words makes him the perfect space buddy you didn't even know you needed.

This Luma offers Mario all kinds of spacefaring support aboard Starship Mario. And who better to do it? With his feet always floating a little bit off the ground, you know he's got his space legs! Lubba's cheerfully casual way with words makes him seem like the friendly space-buddy you always wish you had.

Lubba (In the German manual of the game, Lubba is referred to as a female Luma, and the Toad Brigade also called him a "she" once in the game. The game's official German website identifies him as a male.)

When Mario has 77 Power Stars, or 777 or 7,777 Star Bits, he says, "Hey, you have (number and object)! How lucky! ♪" Additionally, when Mario has 9,999 Star Bits, he says "What happens when you get 9,999 Star Bits? Something nice, I bet!"